Variable-delivery pump



Feb. 20, 1945.

T. W. SPRAKE VARIABLE-DELIVERY PUMP Filed Sept. 14, 1942 2 Sheets-Sheet 1 Q I i I Q I I I I k I. Illl m:

j ll l s T. W. SPRAKE VARIABLE Feb. 20, 1945.

DELIVERY PUMP ZSheets-Shpet 2 Filed Sept. 14, 1942 Patented Feb. 2c, 1945 r 2,369,867

VARIABLE-DELIVERY PUMP Tyler W. Sprake, Seattle, Wash., assignor to Webster-Brinkley 00., Seattle, Wash., a corporation of Washington Application September 14, 1942, Serial No. 458,342

3 Claims.

This invention relates to variable-delivery pumps, and has for its object the perfection of pumps of this nature by providing a structure ineluding reciprocally-mounted pumping pistons The invention provides a manifold 3i which is 1 common to both of the cylinders and connects therewith through the branch openings 32-33, and communicating with this manifold is a pipe working in pairs with a constant stroke and re- 34 whose flow capacity equals or exceeds the comlying, for the accomplishment of theregulatory bined capacities of the two cylinders. Finding function, upon a variable-phase operation. connection through non-return valves with the With this and other objects and advantages in pipe 34 are the induction and the eduction pipes view, the invention consists in certain novel defor the pump, neither of the latter said ipes nor tails of construction and combinations of parts, the non-return valves therefor being shown. as will be hereinafter fully described and finally The operation of the invention is as follows: pointed out in the annexed claims. Assuming the two eccentrics to occupy the rela In the drawingstive positions in which the same are illustrated. Figure 1 is a vertical section with parts in eleand with the bevel pinion 22 held against turnvation and other parts shown fragmentarily taken 1 ing movementlocking the ring gears-it follows on the longitudinal median line of a variablethat the two pistons 2l-28 move inexact unison delivery pump embodying the invention; and with the suction and exhaust strokes of the one Figs. 2 and 3 are transverse vertical sections coinciding with the corresponding strokes of the on the respective section lines 2-2 and 3-3 of other. Each said piston will therefor draw and Fig. 1. expel a full fluid charge in each two-stroke cycle. The reference numeral 5 designates a suitably and the pump will in consequence work at full driven power shaft journaled in bearings 6 and 1 capacity, which is to say at the combined capacireceived in the end boxes 8' and 8" of a casing 8, ties of the two cylinders. Assuming, now, that the and formed as an integral enlargement of the control spindle is revolved such that the crowns shaft to lie centrally of the casing are paired spur of the two eccentrics lie diametrically opposite pinions l0 and II. At each side of these paired from one another--the resultant of an opposite spur pinions there is journaled upon the shaft a directive travel having been imparted through the revoluble cage, as l2 and I3, and carried by these bevel pinion to the two ring gears 2ll'2l'-it will cages are stud shafts l4 and I5 upporting planebe apparent that the suction stroke of the one pistary gears l6 and I1 to have the latter mesh the ton is in coincidence with the exhaust stroke of teeth of the spur pinions. For imparting responthe other and the two pistons balance in that the sive planetary motion to the said planetarygears fluid charge simply passes through the manifold l6 and i1, the latter track in the respective infrom one to the other cylinder, output being zero. stance upon internal gears 20' and 2| provided It will be similarly understood that an intermein rings 20 and 2|. The rings are given a bearing 6-3 diate positioning of the control spindle such that within the casing accommodating relative revoluone eccentric would be caused to precede the other ble shifting movements, one as respects the other by a 90 lead would produce correspondence in ring, and for effecting such movement the rings the directional travel of the two pistons through are each formed with an external bevel gear, as one-half the stroke and develop a pumping out- 20" and 2|", arranged to mesh an interposed put of capacity. Enlarging further on the bevel pinion 22 fixedly mounted upon a control exactitude with which the pump may be governed spindle 23, The said control spindle, regulated for variable delivery within a complete range from by suitable control mechanism, is supported in zero to full capacity is believed to be unnecessary. radial relation to the ower shaft of the pump by intermediate adjustments other than the example a casing-fixed bearing bracket 24. given being thought self-evident. It will of course Reverting to the cages, it will be seen that I be understood that multiple sets of paired radial form the same with sheave-hubs l2 and I3 corpistons distributed at circumferentially spaced respondingly developed about axes ofi-set from intervals about the power shaft of the pump the axis of the supporting power shaft to prowould, for each such set, duplicate the operation duce eccentrics, and these eccentrics, by which 50 of the described single unit. term the sheave-hubs will be hereinafter desig- While having particularly described one emnated, operate through connecting rods 25 and bodiment of the invention I intend that no limi- 28 in the respective instance to drive reciprocally tations be implied therefrom, the expectation bemounted pistons 2'! and 28 working in cylinders ing that the hereto annexed claims will be read 20 and 30. with only such restrictions as are necessarily incommon axis, and each provided with an eccentric hub; planetary gears carried by each of the cage members: ring elements surrounding the planetary gearing oi the respective cage members and providing internal gears in mesh with the planetary gears, said ring elements being mounted for independent revoluble shifting movements about the center or the cage members as an axis; powerdriven pinions meshing the respective-planetary gearing to cause the latter to move planetarily upon the ring elements and responsively impart revoluble movement through the cage members to the eccentric hubs, said hubs, the planetary gear- 11 8. the internal gears, and the driving pinions being alike for each of the two cage members; like pumping units for the respective cage members comprised of radially-located cylinders, pistons therefor, and connecting rods for the pistons driven from the eccentrics; a manifold common to the two cylinders having non-return induction and eduction passages to and from the same; and control devices for imparting relative revoluble shifting movements to the two ring elements {or bodily shifting the planetary gearing and thereby varying the pumping phase 0! one as respects the other of the two Dumping units.

assess-r 2. variable-delivery pump or claim 1 in which said control devices are-comprised or a iournaled pinion interposed between the ring elements and meshing the teeth or a gear provided by each said ring element. 1

3. In a variable-delivery pump: the combination of a pair oi-axially spaced cage members journaled tor revoluble movements-about a com- Jmon axis and each provided with an eccentric hub; respective gears carried for planetary movement by the cage members; ring elements for respective cage members surrounding related planetary gears and providing internal gears in mesh with the latter, said ring gears being arranged for relative rotary shitting movement about the center of the cage members as an axis; a sun gear acting to drive the planetary gearing and, through the planetary travel of the latter, responsively activating the cage members to rotate the hubs or the latter, said hubs, the planetary gears, and the internal gears being alike for each of the two case members; like pumping units for the respective cage members comprising reciprocating pistons, and cylinders therefor, powered from the eccentrics: a manifold common to the two cylinders having non-return induction and eduction passages to and from the same; and a control for the said'relative rotary shifting oi the ring gears.

TYLER W. SPRAKE. 

